EP0239857B1 - Vorrichtung zum Stapeln von flachen Gegenständen, vorzugsweise Doppelbeuteln aus Kunststoffolie - Google Patents

Vorrichtung zum Stapeln von flachen Gegenständen, vorzugsweise Doppelbeuteln aus Kunststoffolie Download PDF

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Publication number
EP0239857B1
EP0239857B1 EP87103776A EP87103776A EP0239857B1 EP 0239857 B1 EP0239857 B1 EP 0239857B1 EP 87103776 A EP87103776 A EP 87103776A EP 87103776 A EP87103776 A EP 87103776A EP 0239857 B1 EP0239857 B1 EP 0239857B1
Authority
EP
European Patent Office
Prior art keywords
stacking
clamping
upper jaws
fixed
holding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87103776A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0239857A2 (de
EP0239857A3 (en
Inventor
Fritz Achelpohl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0239857A2 publication Critical patent/EP0239857A2/de
Publication of EP0239857A3 publication Critical patent/EP0239857A3/de
Application granted granted Critical
Publication of EP0239857B1 publication Critical patent/EP0239857B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/984—Stacking bags on wicket pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/12—Surface aspects
    • B65H2701/121—Perforations
    • B65H2701/1212—Perforations where perforations serve for handling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/191—Bags, sachets and pouches or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2033—Including means to form or hold pile of product pieces
    • Y10T83/2037—In stacked or packed relation
    • Y10T83/2057—Including means to deliver individual pieces to a stack holder
    • Y10T83/2059—With spindle to enter a hole or to make hole in product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2183—Product mover including gripper means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2192—Endless conveyor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/283—With means to control or modify temperature of apparatus or work
    • Y10T83/293—Of tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/463—Work-feed element contacts and moves with work
    • Y10T83/4632—Comprises a work-moving gripper

Definitions

  • the invention relates to a device for stacking flat objects, preferably double bags welded from a plastic tubular or semi-tubular web, with opening edges lying in the region of their center line, according to the preamble of patent claim 1.
  • the double bags welded from a film tube by transverse weld separating seams are placed on stacking plates carried by endless chains, which have a row of stacking pins and / or spring-loaded clamps for receiving the bags on both sides of their longitudinal center line, which clamp the stacks after they have been formed on their central front edge regions in the conveying direction on the stacker.
  • a heated knife can be raised and lowered, which cuts the stack located in the separation station between the rows of stacking pins, the Stacking plate forms the abutment for the cutting knife. Since the stacking plates also form the abutments for the heated knives, these have to be made relatively large and heavy.
  • the known device is therefore relatively expensive because the endless chains must be provided with stacking plates at a distance from the stacks transported by them, which must meet the requirements as abutment plates for the cutting knife.
  • a pair of clamping pins must be provided during stacking, which are raised and lowered alternately or simultaneously after each double bag has been deposited in order to fix it on the stack that is being formed .
  • the clamp that holds the finished stack and engages the central front edge areas prevents the central separation of the stack by the separating knife into two partial stacks, so that expediently stacking pins are provided on both sides of the dividing line through stack holes, which in particular also hold the partial stack.
  • the object of the invention is to provide a device of the type mentioned, the stacking conveyor need only be able to cope with less stress, so that the device can be built more easily and therefore more economically. Furthermore, the device for fixing the finished stack should only have clamping means that do not hinder the central separating cut and also securely hold the separated partial stack on the stack conveyor.
  • the device according to the invention only needs to have simple, light pairs of conveyor belts or the like as a stacking conveyor, since the pairs of conveyor belts or the like only serve to convey and hold the stack and do not at the same time also carry the counter tools for the separation station at a distance from the stack and absorb the cutting pressure have to.
  • a holding plate with only two stacking pins or needles is provided in the stacking station.
  • the holding plate with the stacking pins is designed to be lowerable and only serves to stack each stack in the stacking station. If stacking needles are provided, the objects to be stacked or double bags need not be provided with punched-in positioning holes beforehand, since the objects are pierced by the needles during stacking.
  • the clamping means each consist of two holding tongs, one of which is attached to each of the two conveyor belts or the like, so that the space between these holding tongs remains free for the passage of the separating knife and no additional holding means for the separate partial stacks must be provided.
  • the stacking pins or needles are expediently heated so that they block the successively stacked double bags in the stack that is being formed.
  • the upper jaws of the holding tongs can be mounted on vertical legs of holding plates angled at right angles or of angular profiles about horizontal transverse axes, the other legs on the conveyor belt or the like. are attached and form the counter jaws for the upper jaws.
  • the ends of prestressed tension springs are fastened to fastening devices of the upper jaw and the vertical leg of the holding plates, for example holding pins or hooks, in such a way that their line of action when the upper jaw is pivoted from the clamping position into the open position and conversely passes through its pivot axis, so that the tension spring holds the top jaw in the clamping position or open position on both sides of the dead center position.
  • the upper jaw can be provided with an actuating cam on which the actuating devices for switching the upper jaw act.
  • the actuating devices can consist of frame-fixed run-up curves or also circuit boards or the like provided with drives.
  • a catfish is provided, which is provided with a drive (not shown) and which carries the transport arms 3, which are arranged in pairs and are provided with suction devices or gripping devices.
  • a cross welding separating device (not shown) for welding of bags arranged from a plastic tube or semi-tube web, from which the rotating pairs of transport arms 3 take over the finished double bags, which are still connected in their central region, and needle onto the stacking pins or needles 4, 5.
  • a horizontal shaft 6 is supported, which carries two deflection rollers 7 at a distance from one another symmetrically to the transverse center plane of the pairs of transport arms 3.
  • the horizontal shaft 8 is likewise mounted in a frame, which correspondingly carries a pair of deflection rollers 9 at the end.
  • the deflection rollers 7, 9 run two endless conveyor belts 10, 10 'in parallel and at a distance from each other.
  • a pair of rollers 7, 9 is provided with an intermittent drive, not shown.
  • a support plate 15 is provided between the winding arms 3 arranged in pairs, on which the stacking pins or needles 4, 5 are fastened at a distance from one another in the transverse center plane between the winding arms 3.
  • the support plate 15 is fastened in the middle to the piston rod 16 of the pressure medium-piston-cylinder unit 17.
  • the cylinder of the pressure medium-piston-cylinder unit 17 is connected to the horizontal leg of the angled support piece 18, which is welded to the base support 19 of the device.
  • the support plate 15 is provided parallel to the piston rod 16 for its guidance with a guide pin 20 which passes through a bore of the horizontal leg of the support piece 18 for its guidance.
  • the stacking needles 4, 5 are heated by a heating cartridge, to which the heating current is fed through the lines 22, 23.
  • the support plate 15 By actuating the pressure-piston-cylinder unit 17, the support plate 15 can be lowered so far that the tips of the stacking needles 4, 5 lie below the conveying plane of the conveyor belts 10.
  • the upper strands of the conveyor belts 10, 10 ' are supported on box section supports 25, 25' with smooth or polished tops.
  • the horizontal legs 26, 26' are riveted by angled sheets or connected in some other way.
  • the vertical legs 27, 27 'of the holding plates can rest against the mutually facing inner vertical walls of the box sections 25, 25' for their support and are provided with horizontal bearing journals 28, 28 'on which the upper jaws of the pliers are formed by double-angled pliers clips 29, 29 'are pivotally mounted.
  • the pliers brackets 29, 29 'are designed as double-armed angle levers, the shorter arm 31 forming the actuating lever which carries an end cam roller 32.
  • the pliers 29, 29 'and the vertical legs 27, 27' of the holding plates are provided with holding pins 34, 35, to which the ends of prestressed tension springs 36 are attached.
  • the holding pins 34, 35 are arranged such that the lines of action of the tension springs 36 when pivoting the clamp bracket 29, 29 'cut the pivot axis 28 from its clamping position into the open position.
  • Fig. 1 the first three clamps are in their clamped position, while the right clamp is pivoted into its open position. Since the tension springs 36 pass through the pivot axis 28 when the clamping bracket is switched from the clamping position into the open position, the clamping brackets are on both sides of the Dead center position is loaded either in the direction of its clamping position or in the direction of its open position by the tension springs 36.
  • circuit boards 40, 41 are provided, which in the stacking station S after the formation of a double bag stack 42, the clamping bracket from their open position in their Switch the closed position so that they clamp the respective stack of bags on the conveyor belts 10, 10 '.
  • a stack can be removed from the stacking station S when the stacking needles 4, 5 have been lowered and the stacking conveyor is then intermittently advanced by one step.
  • the circuit board 41 presses the cam roller 32 down, so that the clamp arms 29, 29 'are switched to their open position.
  • Pressure medium-piston-cylinder units 45, 46 which are fixed to the frame are provided for actuating the switching plates 40, 41.
  • two pressure medium-piston-cylinder units 50, 51 are attached above the gap formed between the box girders 25, 25 'to a frame-fixed carrier, the piston rods of which bear a heated separating knife 53, that in the longitudinal median plane between the carriers 25, 25' can be raised and lowered.
  • an abutment extending over the length of the stack 42 is arranged fixed to the frame, the surface of which is aligned with the conveying plane.
  • the width of the abutment is dimensioned so that it can be passed by the clamps and their actuating rollers.

Landscapes

  • Making Paper Articles (AREA)
  • Pile Receivers (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP87103776A 1986-04-04 1987-03-16 Vorrichtung zum Stapeln von flachen Gegenständen, vorzugsweise Doppelbeuteln aus Kunststoffolie Expired - Lifetime EP0239857B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611237 1986-04-04
DE19863611237 DE3611237A1 (de) 1986-04-04 1986-04-04 Vorrichtung zum stapeln von flachen gegenstaenden, vorzugsweise doppelbeuteln aus kunststoffolie

Publications (3)

Publication Number Publication Date
EP0239857A2 EP0239857A2 (de) 1987-10-07
EP0239857A3 EP0239857A3 (en) 1988-10-19
EP0239857B1 true EP0239857B1 (de) 1991-10-16

Family

ID=6297875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103776A Expired - Lifetime EP0239857B1 (de) 1986-04-04 1987-03-16 Vorrichtung zum Stapeln von flachen Gegenständen, vorzugsweise Doppelbeuteln aus Kunststoffolie

Country Status (7)

Country Link
US (1) US4796499A (enrdf_load_stackoverflow)
EP (1) EP0239857B1 (enrdf_load_stackoverflow)
JP (1) JPS62255129A (enrdf_load_stackoverflow)
CA (1) CA1283133C (enrdf_load_stackoverflow)
DE (1) DE3611237A1 (enrdf_load_stackoverflow)
DK (1) DK172787A (enrdf_load_stackoverflow)
ES (1) ES2026141T3 (enrdf_load_stackoverflow)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3719697A1 (de) * 1987-06-12 1988-12-22 Lehmacher & Sohn Masch Vorrichtung zum stapeln von beutelabschnitten
US5000728A (en) * 1987-06-12 1991-03-19 Lemo M. Lehmacher & Sohn Gmbh Maschinenfabrik Method of and apparatus for stacking bag segments
DE3823009A1 (de) * 1988-07-07 1990-01-11 Lehmacher & Sohn Masch Vorrichtung zum stapeln und gegebenenfalls verblocken von kunststoffbeuteln
DE3838563A1 (de) * 1988-11-14 1990-05-17 Windmoeller & Hoelscher Vorrichtung zum stapeln von flachen gegenstaenden
DE3917809A1 (de) * 1989-06-01 1990-12-06 Buehler Optima Maschf Vorrichtung zur bildung von stapeln aus einzelnen beuteln
US5358592A (en) * 1989-07-11 1994-10-25 Nippon Flute Co., Ltd. Bag making machine control
DE3924008A1 (de) * 1989-07-20 1991-01-24 Windmoeller & Hoelscher Vorrichtung zum bilden von stapeln aus aufeinanderfolgend gefoerderten flachen werkstuecken
US5072640A (en) * 1990-04-30 1991-12-17 The Laitram Corporation Cutting apparatus for plastic conveyor modules
DE4119534A1 (de) * 1991-06-13 1992-12-17 Windmoeller & Hoelscher Vorrichtung zum stapeln von flachen gegenstaenden
US5338281A (en) * 1993-03-18 1994-08-16 Ro-An Industries Corporation Wicket servo method and device in a bag making machine
US5542802A (en) * 1994-10-20 1996-08-06 Battenfeld Gloucester Engineering Co., Inc. Wicket stacking guide
US5618147A (en) * 1994-11-10 1997-04-08 Battenfeld Gloucester Engineering Co., Inc. Wicket wire holder
US5738478A (en) * 1995-05-11 1998-04-14 Huntsman Design Products Corporation Automatic wicketing apparatus
US5522690A (en) * 1995-05-11 1996-06-04 Huntsman Design Products Corporation Automatic wicketting apparatus
US5860905A (en) * 1996-10-15 1999-01-19 Bruno; Edward C. System and method for making plastic film bags with headers, open mouths and sealed bottoms
US6511276B1 (en) * 2000-06-13 2003-01-28 Tempel Steel Company, Inc. Parts handling device for press
US20060070351A1 (en) * 2004-10-01 2006-04-06 Solar Communications, Inc. Wicketed bag fabrication and packaging process
US7610737B2 (en) * 2006-08-22 2009-11-03 Valley Tissue Packaging, Inc. Continuous motion wrapping method
US7398630B2 (en) * 2006-08-22 2008-07-15 Lloyd Kovacs Infeed assembly for a continuous motion wrapping assembly
EP2130654B1 (de) * 2008-06-05 2012-08-01 Müller Martini Holding AG Einrichtung zum Beschneiden der Kopf- und/oder Fusskante von durch ein Schneidwerk hindurch geführten Druckerzeugnissen
EP2828168A4 (en) * 2012-03-23 2016-01-13 Bretting C G Mfg Co Inc SMALL PACKAGING MACHINE WITH HIGH SPEED
CN112864959B (zh) * 2021-01-11 2022-04-19 郑州工业应用技术学院 一种电缆自动剥线理线装置
CN120245506B (zh) * 2025-06-03 2025-09-05 福建高盛包装材料有限公司 一种塑料包装袋的剪切导向装置

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US3480271A (en) * 1967-10-18 1969-11-25 Gen Motors Corp Toggle clamp
DE1916130A1 (de) * 1969-03-28 1971-06-16 Windmoeller & Hoelscher Beutelmaschine mit Ablagezylinder
FR2118306A5 (enrdf_load_stackoverflow) * 1970-12-14 1972-07-28 Holweg Const Mec
DE2302477C3 (de) * 1973-01-19 1981-03-26 Stiegler GmbH Maschinenfabrik, 73635 Rudersberg Vorrichtung zum Fördern eines aus folienförmigen Abschnitten gestapelten Stapels
US4207667A (en) * 1977-09-12 1980-06-17 Flexible Design Packaging Machine Company Method and apparatus for automatic sheet cutting and stacking
DE2819728A1 (de) * 1978-05-05 1979-11-15 Hans Lehmacher Vorrichtung zum stapeln und verblocken von kunststoffbeuteln
US4285257A (en) * 1980-02-07 1981-08-25 General Battery Corporation Apparatus for separating battery plates
DE8128146U1 (de) * 1980-09-26 1982-12-09 Fmc Corp., Chicago, Ill. Vorrichtung zur herstellung von beutelstapeln
CH646389A5 (fr) * 1982-02-24 1984-11-30 Bobst Sa Procede pour former en continu des paquets de boites pliees et dispositif pour sa mise en oeuvre.
JPS60135197A (ja) * 1983-12-23 1985-07-18 株式会社浅野研究所 樹脂成形物の直線トリミング装置
DE3505858A1 (de) * 1984-11-23 1986-06-05 Windmöller & Hölscher, 4540 Lengerich Vorrichtung zum stapeln von flachen gegenstaenden, vorzugsweise beuteln aus kunststoffolie
US4668148A (en) * 1985-06-27 1987-05-26 Fmc Corporation Sheet stacking and transferring device
US4699607A (en) * 1985-11-06 1987-10-13 Fmc Corporation Method and apparatus for producing bags
DE3619933A1 (de) * 1986-04-02 1987-10-08 Windmoeller & Hoelscher Vorrichtung zum stapeln von flachen gegenstaenden, vorzugsweise doppelbeuteln aus kunststoffolie

Also Published As

Publication number Publication date
EP0239857A2 (de) 1987-10-07
US4796499A (en) 1989-01-10
CA1283133C (en) 1991-04-16
JPS62255129A (ja) 1987-11-06
DE3611237C2 (enrdf_load_stackoverflow) 1988-04-21
DK172787A (da) 1987-10-05
DE3611237A1 (de) 1987-10-08
DK172787D0 (da) 1987-04-03
ES2026141T3 (es) 1992-04-16
EP0239857A3 (en) 1988-10-19

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